Bottom side. Some decent progress. Found a few small spots of very minor rust, like size of a nickel or smaller. The dirt that remains in crevices is a sandy sort, mixed with cast off fluids and softened factory undercoat. The last challenge is getting all that out of the space between the seatbelt anchor straps and the floor. Guitar string or piano wire should help get that out, followed by a spritz of brake cleaner to flush it out. Then some more seam sealer work, a black enamel over all of it, followed by fresh undercoat.
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